must succour
Regular verb: succour - succoured- succoured

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must succour
you must succour
he must succour
we must succour
you must succour
they must succour 	I must be succouring
you must be succouring
he must be succouring
we must be succouring
you must be succouring
they must be succouring	I must have succoured
you must have succoured
he must have succoured
we must have succoured
you must have succoured
they must have succoured	I must have been succouring
you must have been succouring
he must have been succouring
we must have been succouring
you must have been succouring
they must have been succouring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't succour
you mustn't succour
he mustn't succour
we mustn't succour
you mustn't succour
they mustn't succour 	I mustn't be succouring
you mustn't be succouring
he mustn't be succouring
we mustn't be succouring
you mustn't be succouring
they mustn't be succouring	I mustn't have succoured
you mustn't have succoured
he mustn't have succoured
we mustn't have succoured
you mustn't have succoured
they mustn't have succoured	I mustn't have been succouring
you mustn't have been succouring
he mustn't have been succouring
we mustn't have been succouring
you mustn't have been succouring
they mustn't have been succouring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I succour?
must you succour?
must he succour?
must we succour?
must you succour?
must they succour? 	must I be succouring?
must you be succouring?
must he be succouring?
must we be succouring?
must you be succouring?
must they be succouring? 	must I have succoured?
must you have succoured?
must he have succoured?
must we have succoured?
must you have succoured?
must they have succoured? 	must I have been succouring?
must you have been succouring?
must he have been succouring?
must we have been succouring?
must you have been succouring?
must they have been succouring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I succour?
mustn't you succour?
mustn't he succour?
mustn't we succour?
mustn't you succour?
mustn't they succour? 	mustn't I be succouring?
mustn't you be succouring?
mustn't he be succouring?
mustn't we be succouring?
mustn't you be succouring?
mustn't they be succouring? 	mustn't I have succoured?
mustn't you have succoured?
mustn't he have succoured?
mustn't we have succoured?
mustn't you have succoured?
mustn't they have succoured? 	mustn't I have been succouring?
mustn't you have been succouring?
mustn't he have been succouring?
mustn't we have been succouring?
mustn't you have been succouring?
mustn't they have been succouring?